--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/vr-values.h	Thu Oct 25 10:21:07 2018 +0900
@@ -0,0 +1,145 @@
+/* Support routines for Value Range Propagation (VRP).
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_VR_VALUES_H
+#define GCC_VR_VALUES_H
+
+/* The VR_VALUES class holds the current view of range information
+   for all the SSA_NAMEs in the IL.
+
+   It can be used to hold context sensitive range information during
+   a dominator walk or it may be used to hold range information in the
+   standard VRP pass as ranges are propagated through the lattice to a
+   steady state.
+
+   This information is independent of the range information that gets
+   attached to SSA_NAMEs.  A pass such as VRP may choose to transfer
+   the global information it produces into global range information that
+   gets attached to an SSA_NAME.  It's unclear how useful that global
+   information will be in a world where we can compute context sensitive
+   range information fast or perform on-demand queries.  */
+class vr_values
+{
+ public:
+  vr_values (void);
+  ~vr_values (void);
+
+  value_range *get_value_range (const_tree);
+
+  void set_vr_value (tree, value_range *);
+  void set_defs_to_varying (gimple *);
+  bool update_value_range (const_tree, value_range *);
+  tree op_with_constant_singleton_value_range (tree);
+  void adjust_range_with_scev (value_range *, struct loop *, gimple *, tree);
+  tree vrp_evaluate_conditional (tree_code, tree, tree, gimple *);
+  void dump_all_value_ranges (FILE *);
+
+  void extract_range_for_var_from_comparison_expr (tree, enum tree_code,
+						   tree, tree, value_range *);
+  void extract_range_from_phi_node (gphi *, value_range *);
+  void extract_range_basic (value_range *, gimple *);
+  void extract_range_from_stmt (gimple *, edge *, tree *, value_range *);
+
+  void vrp_visit_cond_stmt (gcond *, edge *);
+
+  void simplify_cond_using_ranges_2 (gcond *);
+  bool simplify_stmt_using_ranges (gimple_stmt_iterator *);
+
+  /* Indicate that propagation through the lattice is complete.  */
+  void set_lattice_propagation_complete (void) { values_propagated = true; }
+
+  /* Allocate a new value_range object.  */
+  value_range *allocate_value_range (void)
+    { return vrp_value_range_pool.allocate (); }
+
+  /* */
+  void cleanup_edges_and_switches (void);
+
+ private:
+  bool vrp_stmt_computes_nonzero (gimple *);
+  bool op_with_boolean_value_range_p (tree);
+  bool check_for_binary_op_overflow (enum tree_code, tree, tree, tree, bool *);
+  value_range get_vr_for_comparison (int);
+  tree compare_name_with_value (enum tree_code, tree, tree, bool *, bool);
+  tree compare_names (enum tree_code, tree, tree, bool *);
+  bool two_valued_val_range_p (tree, tree *, tree *);
+  tree vrp_evaluate_conditional_warnv_with_ops_using_ranges (enum tree_code,
+							     tree, tree,
+							     bool *);
+  tree vrp_evaluate_conditional_warnv_with_ops (enum tree_code,
+						tree, tree, bool,
+						bool *, bool *);
+  void extract_range_from_assignment (value_range *, gassign *);
+  void extract_range_from_assert (value_range *, tree);
+  void extract_range_from_ssa_name (value_range *, tree);
+  void extract_range_from_binary_expr (value_range *, enum tree_code,
+				       tree, tree, tree);
+  void extract_range_from_unary_expr (value_range *, enum tree_code,
+				      tree, tree);
+  void extract_range_from_cond_expr (value_range *, gassign *);
+  void extract_range_from_comparison (value_range *, enum tree_code,
+				      tree, tree, tree);
+  void vrp_visit_assignment_or_call (gimple*, tree *, value_range *);
+  void vrp_visit_switch_stmt (gswitch *, edge *);
+  bool simplify_truth_ops_using_ranges (gimple_stmt_iterator *, gimple *);
+  bool simplify_div_or_mod_using_ranges (gimple_stmt_iterator *, gimple *);
+  bool simplify_abs_using_ranges (gimple_stmt_iterator *, gimple *);
+  bool simplify_bit_ops_using_ranges (gimple_stmt_iterator *, gimple *);
+  bool simplify_min_or_max_using_ranges (gimple_stmt_iterator *, gimple *);
+  bool simplify_cond_using_ranges_1 (gcond *);
+  bool simplify_switch_using_ranges (gswitch *);
+  bool simplify_float_conversion_using_ranges (gimple_stmt_iterator *,
+					       gimple *);
+  bool simplify_internal_call_using_ranges (gimple_stmt_iterator *, gimple *);
+
+  /* Allocation pools for value_range objects.  */
+  object_allocator<value_range> vrp_value_range_pool;
+
+  /* This probably belongs in the lattice rather than in here.  */
+  bool values_propagated;
+
+  /* Allocations for equivalences all come from this obstack.  */
+  bitmap_obstack vrp_equiv_obstack;
+
+  /* Value range array.  After propagation, VR_VALUE[I] holds the range
+     of values that SSA name N_I may take.  */
+  unsigned int num_vr_values;
+  value_range **vr_value;
+
+  /* For a PHI node which sets SSA name N_I, VR_COUNTS[I] holds the
+     number of executable edges we saw the last time we visited the
+     node.  */
+  int *vr_phi_edge_counts;
+
+  /* Vectors of edges that need removing and switch statements that
+     need updating.  It is expected that a pass using the simplification
+     routines will, at the end of the pass, clean up the edges and
+     switch statements.  The class dtor will try to detect cases
+     that do not follow that expectation.  */
+  struct switch_update {
+    gswitch *stmt;
+    tree vec;
+  };
+
+  vec<edge> to_remove_edges;
+  vec<switch_update> to_update_switch_stmts;
+};
+
+extern tree get_output_for_vrp (gimple *);
+#endif /* GCC_VR_VALUES_H */